Becoming a net-zero Air Force can be attained by not flying.
However, toward that aim of a net-zero future, I predict that someday, flying machines will be developed which can take to the air with an expenditure of a mere fraction of the currently typical levels of electrons, SAF, fossil fuel, or any combination thereof, and then will be able to fly around all afternoon over vast distances and amazing altitudes without using any onboard fuel whatsoever! Someday, SOMEDAY… oh wait…